Warm-air heater



June 17, 1924. I 1,497;982

P. H. MA GIRL WARM AIR HEATER Filed Jan. 11, 1923 4 sheets-Sheet l June-17, 1924. 1,49*?982' P.'H. MA GIRL WARM AIR HEATER Filed Jan. ll. 1923 4 SheetsSheet. 2

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Filed Jan. 11 1923 4' sheets-.sheet :5

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d, n, w, no, A@ i a f June l?, 1924. '1,497,982I P. H. MA GIRL WARM AIR HEATER Filed Jan. 11. 1925 4 lShee'f,sSheet. 4

Patented .Jane 17, 1924.

U N IT ED, TIES PATENT orinar.

:PATRICK H. MA GIRL, nnonasnn, Lerner, BIiooMINcfT'on, IIfIiInoIs; B Y Janus n.

MA GIRI., Ina E niitromaivn ennrnnnn'a.' Joarisron,

INeToiv, Intiivols. e

Eemnes; 0r* Besse@ Wem/cem HEATER.

Application lesaanuary 11, 1923.v Serial-No; 612,072.

T 0 all lzii/tom it may concern;

Be it known thatJAMjns D; MA Grim, IDA

E. DifiilroN, andGna'rnUnn A. JoIINs'roN.,`

and useful Improvements in VVarIn-Air Heaters, of which thefollowing is aspecification.

This invention` relates to warm air heaters and is intended to provide an improvedconstruction `over that e covered. by` Letters Patent No. '1,163,676 issued to Patrick H. Ma, Girl under datevofyDecember 14, 1915,.

The, more prominent features of vnovelty in the construct-ion. and operation of the presentv furnace, which` contribute, to a decided increase in 'eiiiciency `overA former heaters ofv this type, cpinpr-ise, firesboX sections provided. with aspecial forni of inter,- lock, for. connecting the `sections `together so as to render the joints gas. and dust-proof;

the provision of self-cleaning pockets or ref cesses in the horizontal, heat-radiating fines ory tuhes which conductthe `prothicts of .iconibustionI from the rear breeching to, the front.

breeching, the flow ofthe productsof. coinbustion being somewhat, retarded by. these pockets into and out of `which aportionof the products pass to make use of the increased radiating surface furnished by.y the walls of the pockets; extensions on the front breaching and i fire-box which` passV freely. through 'suitable` openings therefor in the ornamental-front of the furnace so as to perinit expansion of thev furnacek withoutl dis;`

turbinglthe rornaniental front which iseii.-

cased in masonry; and. the arrangement of.

the baclcbreechiiigs directly .overt-lie rear of the. tigre-.box and supporstedby thelower sections thereof, whereby the` rear, breechings present priine radiating surface to the tire at all times`andare selflcleaning, they soot from the breechings falling intov the iirefbox.

The present heater is moreA particularly intended forA installation in schools, churches, factories and other. publicbuildingsin one orinore units located` in; brick, asbestosf.

lined, sheet-metal or the like casings.

Other objects and' advantagesof the. iin-v proved construction will beapparent from the. following detailed description and the., accompanying drawings in which the` same numerals indicate like parts throughout the severalviews, and whereiii.-

Figure 1 represents a longitudinal; vertis' cal section takenccltrally ofwthe improvedV furnace;

Fig. 2, a plan view of the furnace;

Fig. 3,` a vertical transverseI section takenk on line 3 3 of Fig. 1, looking towards the rear. of the furnace;

Fig. t, a vertical transverse sectiontaken on line t-t of Fig. 1, looking towards the,V

`front of the furnace; Fig. 5, a similar section taken on line of Fig. 1, looking towards the rearofthe furnace;

Fig. 6, an enlarged fragmentary sideele1 vation showing the manner in which the .fires` boxy sections areconnected together;

Fig. 7 a vertical transverse. sectiontaken.

on line 7 7 ofFig. 6,; and

Fig. 8, ahorizontal sectiontaken on line ri-8 of Fig. 6, looking downwardly, the Joints between thev fire-box sections beingv clearly shown.

It is intended that the present furnace structure be` enclosed. in the fusual masonry'` casing which serves to Online the airA to be.

heated and causes it to flow in contact with.

the lire-box andtiues,` and, as such casings are connnon in the art, itis unnecessary toV illustratev this .part of Athe completed heater.

furnace structure includesvthe 'usual'. Icastiron front 1 `provided :with .a [fuel-door. and an aslrpit door 3. The .casting 4 which forms theashfpit 5, is boltedy tothe front l and, at its rear `upper edge, is providedwith an extension orshelf 6.* Extension 6. toff gether with the parts carriedthereby is.

maintained in proper,horizontalposition by.

suitable adjustable supporting means engagg.v ing theY outer end'ofthe extension', as shown.

at 7, Fig. 1. The castingll, forming ashfpit 5 and extension 6is providedwith a pel-l ripheral grooveor channel 8. extending along. the upper side and rear edgesthereof, this channel being. preferably .formedby integral? part of the ash-pit is the upstanding flanges 9 and 10 provided on the casting. Suitably mounted in the upper grate 11 above which is the fire-box 12.

The sides and most of the top of lire-box 12 are formed of flat sections 13 and arched sections` 14 which are preferably corrugated in cross-section, as shown in Figs. 1 and 8, to increase their surface. The lower edges of the arched sections 14 are provided with perforated iianges 15 adapted to cooperate with similar flanges 16 provided on the upper edges of sections 13 for bolting the sections together, as shown in detail in Figs. 6- and 7. Outstanding flanges 17 Y are formed on the lower edges of sections 13 in order to reinforce them f and Vprovide a greater bearing surface for the sections which rest in channel 8 on the upper edges of casting 4, whereby the latter supports the entire fire-box structure. Flanges 17, however, are made sufficiently narrow so as to leaveV a clearance between the lower edges of sections 13 and the flanges 9 and 10 forming channel 8 to allow for expansion and contraction of the fire-box structure.

A specially designed joint is provided between the vertically abutting edges of the ire-boX sections 13 and 14, in order to guard. againstany leakage of the products of combustion through the walls of the fire-box. This joint is shown most clearly in Figs. 6, 7 and 8. Each lire-box section 13 and 14 has formed along one vertical edge a continuous integral bead or enlargement 18,

circular in cross-section as shown in Fig. 8. Each bead 18 is adapted to be received snugly by a corresponding continuous socket enlargement 19 integrally formed on the adjoining edge of the next fire-box section. EachV enlargement 19 has a groove 20, semi-circular in cross-section, which receives bead 18, the maximum depth of this groove being substantially one-half the diameter of bead 18. Inside of fire-box 12,

each socket enlargement 19 is formed with a continuous integral lip 21 projecting from one of the edges of groove 20 and parallel with the face of the lire-box section. the opposite or outside edge of groove 20, socket-enlargement 19 takes the form of a flange 22 which projects substantially at right angles to the face of the lire-box section. Bead 18 of one fire-box section having been located within groove 2O of the ad-v joining section, lip 21 serving as a guide and retainer for this purpose, the two sections are permanently `connect-ed to form a gas and dust-proof joint by means of a metal strip 23 having one. side of its inner edge transversely curved at 24 to conform to the curvature of bead 18. Thus, it will be seen that, when strip23 is secured in place on the outer face of flange 22 by means of bolts 25 located in corresponding openof bead 18 from groove 2O but also to firmly bind or clamp the bead in the groove. Flanges 22 on the fire-box sections 13 do not extend to the lower edge-sof the sections but, together with strips 3, are cut off obliquely at 26 so as to `preclude any pos sibility of interference therewith of flange 9 on ash-pit 5, which might prevent freedom of movement of the parts when the fire-box expands under heat.

The rear wall of the fire-box 12 is formed by plates or sections 27 bolted together' at 2,8 through suitable flanges provided thereon, While at their outer edges sections 27 are suitably connected to the adjoining edges of the rearmostV fire-box sections 13. Sections 27 rest, as do sections 13, in the groove 8 provided on ash-pit 5. The top edges ofrearmost sectiogns 13, the rear` edge of rearmost top section 14 and the upper edges of rear sections 27 are also flanged to provide for bolting thereto member 29 whichvis correspondingly flanged on its adjoining edges for this purpose. Member 29 has two openings 30, 31 in its upper wall which lead respectively into the lower open ends of rear breechings 32, 33 attached to the upper surface of member 29 over these openings. Breechings 32, 33 present prime radiating surface to the fire at all times and, as they open directly into the rear end or extension of lire-box 12, they are self-cleaning, the soot falling down into and being consumed in the lire-box 12.

yThe front end of hre-box 12 is Vformed by a member 34 iianged on its rear edge for bolting to the front edges of the foremost fire-box sections 13 and 14 which are also flanged for this purpose. Extending forwardly from the outer face'of member 34 and secured thereto about the fuel-opening 35 is an extension or flange 36 which projects freely through the corresponding fuel door opening 37 in the ornamental front 1.

Above front fire-box member 34 andthe foremost fire-box sections 13 and 14, is

located the front breeching 38 which is curved transversely to conform to and rest' Lacasse y any wise disturbing ornamental front 1` which, asstated,is set upl inmasonry Door 42 also provides forready access to, the breeching 38 and its connected parts for cleaning purposes.

Each of rearbreeching 32 and 33 and the correspondingside of front breeching 38 is connectedytog'lcther by a group of specially designedhorizontal radiator tubes or flues through the, fines and thereby utilize more efficiently the heat present therein.k

A horizontal smoke pipe 46 leads centrally from the front breeching or .smoke box 38 betweeny thetwo groups of i'afliatoiiiiies 434 to the uptake 47 at the rear of the furnace, the rear end ofthe smoke pipe 46 being closed by a plate 48, secu-red therein. Asuit-` able bracket 50 locatedfon top of member 29 receives and supports the rear end of smoke-pipe 46 in yproper position.

The course of the products of combustion during the operation of the furnace is clearly indicated by the arrows in the several figures of the drawings. The products pass from the fire on grate 11 rearwardly into the rear extension of the tire-box 12 and then upwardly through openings 30 and 31 in inember 29 into rear-breechings 32, 33. Thence they move to the front breeching or smokeboX 38 through the two groups of horizontal radiator tubes or flues 43 in which latter, as stated before, their iow is retarded somewhat due to the presence ofthe upstaiiding pockets or recesses formed by casiiigs 44 Ainto and out of which more or less of the pi'ody ucts tloiv during their forward course tov front breeching 38 thereby increasing the heat radiation of the furnace. As the only opening in front breeching 38 is that into smoke-pipe 46, and as the latter at its rear end leads to the uptake 47, the products of combustion and gases will pass rapidly out of breechiiig 38 and through smoke-pipe 46 to 11p-take. 47.

In the construction described, eliicient ga` and dust-proof joints are provided at vital points in the structure, the arrangement of the various parts is simpliied and ample rovision made for replacement of parts. *Xpansion and contraction of the tire-box and connected parts are provided for and the maximum heat-radiating capacity cfa.`

furnace of utilized. l

Vhat is claimed is; i 1. In a furnace of tliecharacter described, the combination of a fire-box; a front breeching located above the lire-box; a rear breeching located above and communicating with this type fully andcoinpletely the rear of thev fire-box heat-radiating fiues connecting said front and rear breechings, said flues being provided with outwardly projecting pockets opening into the fines for retarding the flow of products` of combustion` therethrough and increasing the heat-radiation thereof; a smoke-pipe extending rearwardly Vof the furnace from said front breeching; and anup-take for said smokepire r r 2. In a furnace, theV combination of a `fireboX having a pair of openings in the rear portion of its upper wall; apair of rear breechings mounted on the rear endof the` fire-box and vhaving their lower open ends in registry with said pair of openings in the tire-,box to provide unobstructed upright passageways between the rear breechings and the fire-box; a front breeching located above the fire-box; a 'pair of groups. of heat-radiating tubesconnecting the rear breechings with the corresponding sides ofthe front breeching; a smoke-pipe extending rearwardly of the furnace from said front breecliing and between the pair of groupsof heat-radiating tubes; and an rip-take fextending froin the smoke-pipe betweenr said pair of rear breechings.

3. In a furnace, the combination of a tireboX formed of sections, said sections being provided on their abutting edges with continuous integral beads, circular in cross-section7 and continuous, integral sockets to receive said beads; strips coextensive with said beads for clamping the beads in their corresponding sockets; means for detachably securing said strips in place; a pair of rear breechings located above the fire-box, said breechings being open at their lower ends` and communicating with the rear of the fireboX through corresponding openings provided in the upper wall thereof; a front breecliiiig located above the fire-box; a pair of groups of heat-radiating iues connecting said pair of breechings with the corresponding sides ofthe front breeching; said flues being provided with outwardly pro# jecting pockets opening therein for retarding the flow of the products of combustion through the flues to increase the heat-radiation thereof; a smoke-pipe extending rearwardly of the furnace from the front breeching; and an up-take connected to the smoke-pipe between the pair of rear breechings.

4. In a furnace, the combination of a furnace front having upper and lower openings Uli therein; a lire-box having a fuel opening in its front wall; a tubular extension on the lire-box about said fuel opening and projecting freely through saidV lower opening in the furnace front; a rear breeching open at its lower end and registering with a corresponding opening in thetop of the rear of the lire-box so as to provide an unobstructed upright passageway; va front brceching having an opening in its front wall; ak tubular y extension on the front breeching about said opening and projecting freely through said upper opening in the furnace front; heat-radiating flues connecting said front and rear breechings, said fines being provided with outwardly pro-Y jecting pockets opening into the flues for retarding the flow of products of combustion Jtherethrough; a smoke-pipe extending rearwardly of the furnace from `the front breeching; and an up-take for said smokepipe.

5.V In a furnace, the combination of a fire box open at the upper portion of its rear end; a rear breeching mounted on the rear end of the fire box and havingits lower open end in registry with the open end'of the fire box to provide an unobstructed upright passage way between the rear breeching and the rear end of the fire box; a front breeching; a pair of groups of heat radiating tubes connecting the rear breeching with the front breeching; a smoke pipeV extending rearwardly of the furnace from said'front breeching, between the pair of groups of heat radiating tubes, and supported at its rear end by the top of the fire box; and an uptake extending from. the rear end of the furnace pipe.

6. In a furnace, the combination of a onepiece, metallic front having upper and lower openings therein; a closure for said upper opening; 'a closure for said lower opening; an ash pit structure connected to said front; a lire box supported by said ash pit struc! ture and adapted for Vrelative movement therewith to permit expansion and contraction of the parts, said fire box having a fuel opening in its front wall; a tubular extension on the fire box about said fuel opening, said extension projecting freely through the lower opening in the front; a rear breeching supported by said fire box; a front breeching having an opening'in the front wall thereof; a tubular extension on the front breeching about said opening, said extension projecting freely through the upper-opening in the front; heat radiating flues connecting said front and rear breeching; a smoke pipe extending rearwardly of the furnace from the front breeching; and an uptake connected to the rear end of the smoke pipe.

PATRICK I-I. MA GIRL; DECEASED; By JAMES I). MA GIRL,

IDA E. DALTON, j GERTRUDE A. JOHNSTON,-

Eecutors. 

